Electric jump-spark coil



1,629 132 May l927 c. H. THORIDARSON 9 ELECTRIC JUMP SPARK COIL Filed Feb; 27, 1925 2 Sheets-Sheet 1 I 1,629,132 May 1927' H. THORDARSON ELECTRIC JUMP SPARK COIL Filed Fem-27, 1325 2 Sheets-Sheet J6 ii I? i? 20 g g E 23 E Tho/r" a R3070,

Patented May 17, 1927.

UNITED STATES CHESTER Ha THORDARSON, OF CHICAGO, ILLINOIS.

ELECTRIC JUMP-SPARK COIL.

' Application filed February 27, 1925. Serial m. 12,046.

This invention relates to improvements in ,jump sparkcoils for the ignitionsystems of explosion engines.

Among the objects of the invention are to, so dispose the primary and secondary windings on the core as to avoid overheating of the primary winding or windings, and to insulate the primary winding from the sec-- ondary winding within compact space; to decrease the length of the turns of the secondary winding, while at the same time making'it possible, in a compact structure, to use heavier insulation between the turns of the secondary winding, and to otherwise improve and simplify coils of this character, as well also the attachment of the coil to a support.

The invention consists in the elements and combination of elements shown in the drawings and described in the specification, directed to one embodiment of the invention, and the invention is pointed out in the appended claims.

In the drawings:

Figure 1 is a side elevation of a jump spark coil embodying my invention, showing it attached to a support, as the body frame member of anautomobile.

Figure 2 is an end view thereof.

Figure 3 is aface view of one of the end caps of the shell which encloses the coil structure.

Figure 4 is a perspectlve view of an adapter bracket for attaching thev coil to a support.

Figure 5 is an axial section of the coil structure, showing the terminals of the duo primary coil brought out at one end of the Figure 12 is a simple diagram of the coil circuit.

As shown in the drawings:

l5 designates a casing in which the coil structure is enclosed. It can be made of any suitable insulating material and as herein shown is of cylindric cross section. It has end closing caps 16, 1? of a material that is a good conductor and preferably non-magnetic, such as brass. 18 designates, as .a whole, a core type magnetic circuit. It is laminated, the groups of laminae being of L shape and symmetrical with the short end of one group, disposed" toward but spaced from the inner face of the other group and spaced by air gaps 19, produced preferably of quite thin insulation, The members of the core are held together by clasps 20 flanged over the outer ends of the core thus made. The core may have a single air gap, but for structural reasons and symmetrical grouping two are shown.

There are two primary windings 21, connected at, their inner turns by a conductor 22. Said primary windings are preferably made of ribbon wire, being wound on a hollow insulating tube 23 which fits closely on one 1e of the core and by which it is insulate from said core. The turns can be insulated from each other by enamel, or by in-tercoiled thin strips, or otherwise.

24 designates the secondary winding. It is herein shown and is preferably made of light enamel, or otherwise insulated, wire that is wound on a hollow, rectangular tube 25 which fits closely on a leg of the core, and bywhich said secondary winding is insulated from said core. The secondary winding is enclosed by a suitable sheath 24.

Disposed about said secondary winding is a wide distributing plate or shield 26 of light gauge conducting metal to which-the outer turn of the secondary winding is connected, as shown in Figure 10.

By ins ection of Figure 5,-it will be noted that th iZWO primary windings, connected by the conductor 22, are mounted on the same leg of the core as is the secondary winding 24, and that said secondary winding is spaced at its ends a distance from the adjoining primary windings for a purpose hereinafter mentioned. Additionally, there is interposed between the adjacent ends of the primary and secondary windings insulating sheets 30; such as mica, said sheets being shown as constituting end parts of a lamii nated U-shaped member, the closed portion 31 thereof lying between the secondary and the leg of the magnetic circuit not enclosed constitutes an insulating sheath for the conductor connected to the outer turn of one of the primary windings 21 so as to bring the terminal 36 of said conductor out on the same,

end of the coil structureas the conductor 37 of the other primary winding (Figure 5). This primary winding circuit includes the binding posts 38; 39, appropriated respectively to the switch and interrupter (not shown).

The said secondary and primary'windings may be fixedly sustained on-the core, while bein assembled, by the use of insulating spaclng strips 2l' -(Figure 5) between the ends of said windings, and all conducting elements not in circult with'each other are held rigidly sustained and are embedded in a body 33 of insulating compound, poured within the casing after the coil structure has been installed therein, said compound'there- .after hardening as an insulating and a holding mass.

Y 40 (Figures 5, 6 and 12) designates a condenser that is included in a circuit which is herein shown as connected between-the inp v 43, be grounded on the core structure throughthe terrupter binding post 39 arid the condenser binding post 41. As shown in Figure 5, the condenser 40 can, by a flat or strip conductor the binding post 41, which is applied on the end of the core structure and is pierced for end by the application of the adjacent end cover 17, and the terminal thereof can be bent over as an extension 48 to lie along the lateral ed e of the core structure (Figure 5). Said bin ing, post 41 has an optional con- ,nection'42 (Figure 5 which may be grounded to a good groun connection exterior to the coil, in the event that the'condenser ground within the coil circuit shouldbecome defective. The optional connection42 can be confined between a washer 48 and a base piece 47' of the said binding post 41.

' designates a high tension current binding post which-is in acircu'it that is groundsystem. The mechanic ed on the outer turn of the secondary winding, and which-also includes one of the electrodes 56 of the spark aplug of an ignition ground connection between the post 55 and the secondary coil embraces an S-shap ed spring 60 within the assage of said binding post. Said flat con uctor can be pressed closely on the core said core, two-primary win n ser es and mounted on and spaced along From the foregoing, it will be noted that when using dualprimary windings, said windings are separated along the core struc-.

ture by large air spaces to provide ample insulation between the ends of the secondary winding-and the primary windings, and so' also to avoid transmission of heat from the secondary to the primary windings. Furthermore, thevdisposition of the primary and the secondary windings oncthe core, as shown, enablesthe potential difference between the turns of the secondary to be small... The coil structure is very compact and is easily 'assembled on the core structure and thecon--- nections are readily brought out. I

The core casing can be su ported by mean of an adapter-bracket 0 U form, the end legs 66 of which are clasped tightly on the outer faces of the end caps 16, '17. Said end legs are secured to the end caps by studs 67 which extend through openings 67' in said legs, and enter openings 68 in the caps. The entire coil structure is held from turning about said studs as a pivot by passing the legs 66 closely between parallel guide and holding ribs 69. The adapter fitting shown is provided with a number of openings 70, some of which are in the closed portions thereof and others in the legs of the bracket, for the reception of a fastening screw 72, that extends through a support 73; a lock washer 74 being employed to hold the screw in vplace. The number of openings shown in the closed and leg portions of the adapter bracket provide means for attaching the coil structure case in various positions on the carrying support, that is to say", from either end thereof, or centrally or eccentrical-ly.' I claim: p 1. In an electric jump spark coil, a core, a secondary winding centrall on one leg of d ings connected said leg a distance from each end of the secs ondary winding to avoid heat transference from the secondary" to the primarywindlngs, and an insulating sheet lyin between the secondary winding and the'otlier legof said core and turned outwardly at its ends to form. insulating barriers between the ends of the secondary and the primary windings.

2. In an electric jump spark coil, a core, a secondary winding centrally on one leg of said core, two primary windings connected in series and mounted on and spaced along the leg a distance from each end of the secondary winding to avoid heat transference from the secondary to the primary windings, an insulating sheet lying between the said core, two primary windings connected 3. In an electric secondary winding and the other leg of said core and turned outwardly at its ends to form insulating barriers betweenthe ends of the secondary andthe primary windings, and a second insulating sheet parallel to said first insulating sheet and having out-turned ends which lie along the outer faces of the primary windings.

'ump spark coil, a core, a secondary winding centrally on one leg of in series and mounted on and spaced along the leg a distance from each end of the secondary winding toavoid heat transference from the secondary to the primary windings, an insulating sheet lying between the secondary windings and the other leg of said core and turned outwardly at their ends to form insulating barriers between the ends of the'secondary and the primary windings, and a secondary insulating sheet parallel to said first insulating sheet and having outturned ends which lie along the outer faces of the primary windings,the outer terminal of one of said primary windings extending between the intermediate portions of said insilating sheet and brought out on the same end of the coil asthe outer terminal of the other primary winding.

arms to receive a connection to clamp the bracket in different positions on a support.

lin combination, a jump spark coil including an enclosing shell and a metallicend cap, said end cap having spaced ribs on the outer face, a bracket comprising a part lying beside said shell and arms extending across the ends of the shell, one of said arms fitting between said ribs on the cap, fastening means holding the latter arm to said cap, and there being numerous spaced openings distributed along said bracket, both in the part lying beside the shell and the arms, said openings being adapted to receive a connection to hold the bracket in different positions on a support.

In witness whereof I claim the foregoing as my invention, it hereunto append my signature this 18 day of February, 1925.

CHESTER H. THORDARSON. 

